Sealant/Glue for a Part Immersed in Gasoline

[dalmatiangirl61]

What type of sealant or glue can withstand constant immersion in gasoline? I disassembled a new mechanical fuel pump and the check valves were glued in place, they are about .015" smaller in diameter than the older style that were pressed into place. I see several of the Locktite products that say "gasoline resistant", but don't think they were made for constant 24/7 immersion in gasoline.

 

[steve45]

Although not certified for aircraft use, I've successfully repaired fuel tanks of two of my airplanes with Devcon F epoxy. One repair lasted about 8 years before the airplane was destroyed by a wind storm. The other lasted a couple of decades until I changed the tank.

You should visit their website and look at all the specialty products they offer.

 

[redlee]

Clear Nail Polish works, use it for carbs all the time. Dont know how well in your application.

 

[standardparts]

Although not certified for aircraft use, I've successfully repaired fuel tanks of two of my airplanes with Devcon F epoxy. One repair lasted about 8 years before the airplane was destroyed by a wind storm. The other lasted a couple of decades until I changed the tank.

You should visit their website and look at all the specialty products they offer.

"Although not certified for aircraft use, I've successfully repaired fuel tanks of two of my airplanes"
No log book or maint record entry I take it? IF the acft would have gone to a differant owner what a nasty surprise. Sign off on your own annuals or did it just get pencil whipped? Bogus unapproved repair on a fuel tank. What a POS you are.

 

[john.k]

I assume this is your AC fuel pump.........Ive seen the valves in these pumps that were pressed in and staked in 3 placed come out of the zamak/mazak pot metal from mechanical stress..........An earlier (1960s) version of these pumps had the valves held in by a brass retainer secured by small brass screws.........And an even earlier version had the valves secured by threaded rings in separate chambers at the side of the pump.

 

[dalmatiangirl61]

I assume this is your AC fuel pump.........Ive seen the valves in these pumps that were pressed in and staked in 3 placed come out of the zamak/mazak pot metal from mechanical stress..........An earlier (1960s) version of these pumps had the valves held in by a brass retainer secured by small brass screws.........And an even earlier version had the valves secured by threaded rings in separate chambers at the side of the pump.

Yes, this is the forklift pump. The Napa pump was close, but it was not going to work, don't think they will let me return it now. They used some type of clear glue to hold the check valves in place, several drops were in places they should not have been, strong stuff! The only 2 part epoxy claiming chemical resistance I could find at the hardware store today was JB marine weld, going to test it before using it. The old check valves measure 1.000", the new ones are .993" and just fall into place.

Steve
I think the Devcon F is going to be too thick for this application, but will see what else they offer.

Redlee
Where do you use nail polish in carbs? Full immersion without breaking down?

 

[redlee]

Sealing floats , welsh plugs. Its not affected by Gasoline. Must be clear.

 

[Gordon Heaton]

"Although not certified for aircraft use, I've successfully repaired fuel tanks of two of my airplanes"
No log book or maint record entry I take it? IF the acft would have gone to a differant owner what a nasty surprise. Sign off on your own annuals or did it just get pencil whipped? Bogus unapproved repair on a fuel tank. What a POS you are.

Well, you're kind of high and mighty. Maybe they were homebuilts.

 

[standardparts]

Well, you're kind of high and mighty. Maybe they were homebuilts.

Really?

 

[Gordon Heaton]

. . .The old check valves measure 1.000", the new ones are .993". . .

That's perfect for bearing mounting compound. I like the green VibraTite. It comes in thin and 'gap fill' up to .015". I don't know for sure but I'd be surprised if it wasn't fuel resistant.

 

[markz528]

I have used this several times for sealing gas tanks.

https://www.amazon.com/Seal-All-380112-Contact-Adhesive-Sealant/dp/B008VK0JS4

 

[henrya]

This stuff is supposed to be good in fuel tanks.

PC-7® Paste Epoxy – Protective Coating Company

www.pcepoxy.com

 

[steve45]

standardparts said
"No log book or maint record entry I take it? IF the acft would have gone to a differant owner what a nasty surprise. Sign off on your own annuals or did it just get pencil whipped? Bogus unapproved repair on a fuel tank. What a POS you are."

This was done over 40 years ago under the advice of a IA.

I suggest you find somebody else to bother because I really don't give a shit what you think.

 

[john.k]

Maybe what appears to be glue ,is actually a UHMW PE push in bushing & retainer.

 

[Vecair]

What type of sealant or glue can withstand constant immersion in gasoline? I disassembled a new mechanical fuel pump and the check valves were glued in place, they are about .015" smaller in diameter than the older style that were pressed into place. I see several of the Locktite products that say "gasoline resistant", but don't think they were made for constant 24/7 immersion in gasoline.

Use aircraft fuel tank sealant. I have many times and it is impervious to fuel. They use it to seal the inside of fuel tanks. Two part. Several choices here. https://www.aircraftspruce.com/menus/cs/fueltanksealants.html

 

[Doozer]

https://nomorerust.com/store/blog/history-and-science-behind-mastercoat-and-how-it-works-n1

Here is a link to PM Industries, Master series of coatings.
I still call it paint, but whatever.
I was farmilliar with POR15 origionally
and how it works, and how NOT to get it on your skin.
I figured out the "moisture cure" part, as in once you
open the can, it begins to harden.
All that said, POR15 is good stuff.
I was at the car show in Carlisle and I saw this PM Industries
stuff. About 10 bucks cheaper than POR15 so I bought a can.
I had a steel gas tank with some pin holes in it.
I used my standard phosphoric acid clean and etch procedure.
Did a final etch with white vinegar and dried the tank out.
In the tank I put some of the PM Industries Master Series SILVER
paint. Turned the tank every which way, and poured out the excess.

That was over 20 years ago. Tank is still perfect.
I know they don't market this stuff specifically for gas tank coating,
but it says it is gasoline proof. I can attest that it truely is.
I honestly think POR15 SILVER is the same stuff.
Like the exact same stuff. The paint company must just put a different
label on the cans. I have seen all kinds of gas tank sealers on the
market. From Kreem to Red Kote. Nothing dries harder and is more
bullet proof for gasoline than this silver moisture cured urethane paint.
It just happen that I have actual proof of success using the PM brand
product.

TIP- If you have a screw on gas cap, use a polyethlyne sandwitch bag
over the threads, then screw the cap on, trapping the sandwitch bag.
This seals off the area pervectly, all the way to the top of the tank threads.


--Doozer

 

[Bill D]

Solder or lead wool as packing pressed in?
Bill D

 

[dalmatiangirl61]

Thanks for the suggestions, there is 4" of snow on the ground, and its not looking any better for the next few weeks, so I'm going to test a few and see what works the best. I kind of like the nail polish idea because if it ever needs to be rebuilt again I can just drop it in acetone to remove the seals.

 

[Homeshopblob]

Devcon (Now Loctite) 5 minute epoxy holds up to gasoline. My first application is now 30+ years old and still pliable, and still holding. Hardware stores have it.

 

[dalmatiangirl61]

Devcon (Now Loctite) 5 minute epoxy holds up to gasoline. My first application is now 30+ years old and still pliable, and still holding. Hardware stores have it.

Any idea what chemical will dissolve epoxy? I don't want to use something that will make it where I cannot rebuild the pump in the future.

Edit: Called customer service at JB Weld and they say the marine epoxy will not hold up to constant immersion in gasoline, so I can strike that one from the list.

Edit again: I have some Permatex sleeve retainer (green), used it on a press fit application a few weeks back and noticed that the ring remaining exposed never hardened. According to TDS it will only harden in an anaerobic application, which leaves me questioning if it will work in this application, I'd prefer something with a guaranteed set so it forms a lip to hold the seal in place. Striking it from the list.